Weld-free connection method and connection structure of large-diameter steel cage

Abstract

The invention discloses a non-welded connection method and connection structure for a major diameter reinforcing cage. The non-welded connection structure comprises upper layer main reinforcements, lower layer main reinforcements, sleeves, limiting steel plates and connecting plates, wherein each limiting steel plate is a semicircular steel plate; a plurality of semicircular limiting grooves for being matched with the main reinforcements in diameter are uniformly distributed on the inner circumference of each limiting steel plate; a unidirectional thread is formed in each sleeve; threads with identical screwing direction are formed in the connection end of each upper layer main reinforcement and each lower layer main reinforcement; each upper layer main reinforcement and each lower layer main reinforcement are connected through each sleeve; each connecting plate is crescent-shaped, and is used for respectively connecting the corresponding two ends of two semicircular limiting steel plates through bolts to form a whole circle. According to the invention, through the adoption of the non-welded connection method, the operation is convenient, the alignment of the upper reinforcements and the lower reinforcements is precise, the connection is reliable, the construction cycle is shortened, the connection and mounting in place of a reinforcing cage with the major diameter of 45 meters can be completed within only about 2 hours, and the condition of pouring pile foundation concrete can be realized.

Description

technical field [0001] The invention relates to a welding-free connection method and connection structure of a large-diameter steel cage used for super-large-diameter cast-in-place piles. Background technique [0002] With the acceleration of economic construction and the increase of transportation road load, the existing transportation roads are difficult to meet the transportation capacity required by the growing economic speed, so there are large-scale road and bridge constructions, especially in some areas where the geological conditions are too harsh. Poor, the current construction of roads and bridges has high standards: the traffic flow is large, the vehicle is large, and the control of foundation settlement is more stringent. Therefore, more pile foundations are designed to cope with complex geological conditions. The diameter of the pile foundation is super large and the depth is super Deep, especially the depth of 40-50 meters is common. The reinforcement cage is c...

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Problems solved by technology

[0002] With the acceleration of economic construction and the increase of transportation road load, the existing transportation roads are difficult to meet the transportation capacity required by the growing economic speed, so there are large-scale road and bridge constructions, especially in some areas where the geological conditions are too harsh. Poor, the current construction of roads and bridges has high standards: the traffic flow is large, the vehicle is large, and the control of foundation settlement is more stringent. Therefore, more pile foundations are designed to cope with complex geological conditions. The diameter of the pile foundation is super large and the depth is super Deep, especially the depth of 40-50 meters is common. The reinforcement cage is configured in a long way, and the diameter can be used up to 32. The number of main reinforcements in a single pile can reach more than 40. Therefore, it is usually necessary to weld the reinforcement cage on site segment by segment. Put it into the hole, and the reinforcement cage is usually made into 12 meters (the length of a steel bar). Because the weight of the reinforcement cage is too large, it must be hoisted in place with the help of a large-tonnage crane. The crane is also used to lift the reinforcement cage after a section of welding is completed. The next section of steel cage is hoisted and welded in the hole until it is completed. Because the alignment of steel bars is very difficult, and the welding seam is vertical welding, the welding efficiency is low. Taking a 45-meter steel cage as an example, at least three sections of joints need to be welded, even if it is arranged Multiple welding workers are welding at the same time. It usually takes 8-10 hours to complete the welding and installation of the steel cage of a pile foundation. It usually requires a 25-ton crane to complete it. According to the average market price, only the crane shift fee is one steel bar. The cage costs 2,500 yuan, and the construction cost of a single steel cage is not small

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